package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {
    //设置本地图片存储路径
    @Value("${reggie.path}")
    private String basepath;

    //文件上传
    @PostMapping("/upload")
    public R upload(MultipartFile file) {
        //file是一个临时文件，需要转存到指定位置，否则本次请求完成后临时文件会删除
        log.info(file.toString());

        try {
            //原始文件名
            String originalFilename = file.getOriginalFilename();
            //获得图片后缀
            String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

            //使用UUID重新生成文件名，防止文件名称重复造成文件覆盖
            String fileName = UUID.randomUUID().toString()+suffix;

            //创建目录对象
            File dir = new File(basepath);
            //判断目录是否存在
            if (!dir.exists()){
                //不存在新建一个
                dir.mkdirs();
            }

            file.transferTo(new File(basepath+fileName));


            return R.success(fileName);
        } catch (IOException e) {
            e.printStackTrace();
            return R.error("上传失败");
        }


    }


    //文件下载
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        try {
            //获得输入流,读取文件内容
            FileInputStream fis = new FileInputStream(new File(basepath + name));
            //获得输出流,写数据到浏览器
            ServletOutputStream ops = response.getOutputStream();

            //设置响应格式
            response.setContentType("image/jpeg");


            //循环读写
            byte[] bytes = new byte[1024];
            int len=0;
            while ((len=fis.read(bytes))!=-1){
                ops.write(bytes,0,len);
                ops.flush();
            }


            //关闭流
            ops.close();
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}
